When you’re looking to design and manufacture custom CNC machined silicone parts, the chemical and mechanical properties play a pivotal role in ensuring performance and durability. Whether you’re working in medical, food, industrial, or electronics sectors, selecting the right silicone material for CNC machining can significantly impact the success of your project. At Siliconebase, we specialize in providing high-quality, precision-engineered silicone parts, offering OEM service to meet the unique needs of each client. In this blog, we will explore the chemical resistance and mechanical properties of custom CNC machined silicone parts, and how these features influence the performance of your final product.
What Are the Chemical Resistance Properties of Silicone?
When choosing materials for CNC machining, chemical resistance is one of the most important factors, especially if your parts will be exposed to harsh chemicals. Custom CNC machined silicone parts are renowned for their excellent chemical resistance, making them ideal for applications in industries that require high performance in environments exposed to acids, bases, solvents, and other chemicals.
Silicone, in its pure form, is highly inert and stable. It resists degradation in the presence of moisture, UV radiation, ozone, and a variety of acids and bases. However, like any material, it has its limits. Understanding which chemicals silicone can and cannot handle is crucial for designing a successful part.
Silicone’s Resistance to Common Chemicals
Silicone excels in resisting many common chemicals, making it suitable for industrial and food-grade applications. It is highly resistant to:
- Water and Steam: Silicone withstands both hot water and moisture, which makes it great for seals and gaskets in wet environments.
- Weak Acids/Bases: Silicone performs well against substances like vinegar and soap solutions, which are commonly found in consumer goods and medical products.
- Ozone and UV Radiation: Silicone is naturally resistant to the harmful effects of UV radiation, making it ideal for outdoor applications where sun exposure is a concern.
However, silicone’s resistance to certain aggressive chemicals—such as concentrated sulfuric acid, some organic solvents (gasoline, toluene, acetone), and oils—may be compromised. Swelling or material degradation can occur when silicone is exposed to these substances for extended periods. For this reason, it’s important to assess the operating environment carefully before choosing silicone.
Chemical Resistance Guide for Silicone:
| Chemical Type | Resistance Level | Examples |
|---|---|---|
| Water & Steam | Excellent | Hot water, moisture |
| Weak Acids/Bases | Good to Excellent | Vinegar, soap solutions |
| Strong Acids/Bases | Poor to Fair | Concentrated Sulfuric Acid |
| Organic Solvents | Fair to Poor | Gasoline, Toluene, Acetone |
| Oils (Petroleum) | Fair to Poor | Mineral oil |
| Ozone & UV | Excellent | Outdoor exposure |
What Are the Mechanical Properties of CNC Machined Silicone?
The mechanical properties of silicone parts are as crucial as their chemical resistance, especially when the part needs to withstand physical stress. Custom CNC machined silicone is not only flexible but also strong enough to handle rigorous use in various industries. Whether it’s for a medical device, food processing equipment, or a heavy-duty industrial application, silicone offers outstanding durability.
Flexibility and Elongation
One of the key mechanical properties of silicone is its flexibility. Silicone can stretch without breaking, which makes it a great choice for parts that need to be bent, compressed, or stretched, such as seals, gaskets, and O-rings. The elongation of silicone allows it to stretch up to several times its original length without tearing, ensuring a secure fit even in dynamic environments.
Hardness and Durability
Silicone parts can be manufactured in various hardness levels, measured in Shore A. From soft and squishy to firm and tough, this range of hardness makes silicone suitable for a wide range of applications. For instance, softer silicones (around 30–40 Shore A) are used for products like baby products or wearables, while firmer silicones (70–80 Shore A) are used for applications that require higher durability and resistance to mechanical wear.
Tensile Strength and Compression Set
Tensile strength measures the force required to pull silicone apart, while compression set measures how well the material returns to its original thickness after compression. Silicone has a very low compression set, meaning that it will maintain its original form and not flatten out, even after prolonged compression. This property is especially important for sealing applications where long-term performance is required.
How CNC Machining Affects Silicone Parts
When CNC machining silicone, precision and careful handling are essential due to its unique properties. Unlike hard metals, silicone is soft but can be “grabby” during machining, which means special care must be taken to avoid stretching or tearing the material. At Siliconebase, we utilize advanced CNC machinery and high-precision tooling to ensure that silicone parts are machined with tight tolerances and excellent surface finishes.
Key CNC Machining Considerations for Silicone Parts:
- Tool Sharpness: Silicone requires extremely sharp tools to ensure a clean cut without damaging the material.
- Cutting Speed and Feed Rate: Cutting speeds need to be slower than for harder materials like metal to prevent overheating or tearing.
- Workholding: Silicone is flexible, so it requires special fixtures to hold it securely during machining without deforming the material.
Custom CNC Machined Silicone in Different Industries
At Siliconebase, we work with clients in a wide range of industries that require custom CNC machined silicone parts. Here are some of the applications where silicone’s chemical and mechanical properties make it the ideal choice:
1. Medical Devices:
Silicone is biocompatible, non-toxic, and resistant to harsh sterilization methods, making it a top choice for medical devices like seals, gaskets, and diaphragms.
2. Food and Beverage:
Food-grade silicone is flexible, durable, and easy to clean, making it perfect for food processing equipment, baking molds, and seals.
3. Industrial Applications:
Silicone’s resistance to heat, chemicals, and UV exposure makes it suitable for industrial seals, gaskets, and custom parts that need to withstand harsh environments.
4. Electronics:
Silicone is often used for electronic enclosures and seals because of its excellent insulation properties and resistance to moisture and dust.
Why Choose Siliconebase for Custom CNC Machined Silicone Parts?
At Siliconebase, we are committed to providing high-quality, precision-engineered silicone parts tailored to your exact needs. As a trusted supplier of custom CNC machined silicone parts, we offer one-stop service for all your manufacturing needs, from design and material selection to production and delivery. Whether you’re in the medical, food, industrial, or electronics sectors, our expertise in silicone machining ensures that we deliver parts with exceptional chemical resistance and mechanical performance.
Our OEM services allow us to provide customized solutions that fit your exact specifications, ensuring the highest level of performance for your application. Our skilled team works closely with you to select the right materials, machining techniques, and designs to meet your project’s specific requirements.
Get in touch with us today at Siliconebase to discuss your custom CNC machined silicone parts and find out how we can help you with your next project. Whether you need small quantities for prototypes or high-volume production, we are here to provide reliable, cost-effective solutions that meet your needs.